The Collaborative International Dictionary of English v.0.48:
Evenfall \E"ven*fall`\, n. Beginning of evening. "At the quiet evenfall." --Tennyson. [1913 Webster]WordNet (r) 3.0 (2006):
evenfall n 1: the time of day immediately following sunset; "he loved the twilight"; "they finished before the fall of night" [syn: twilight, dusk, gloaming, gloam, nightfall, evenfall, fall, crepuscule, crepuscle]